CN112217382A - Flying capacitor circuit, circuit module and power conversion device - Google Patents

Flying capacitor circuit, circuit module and power conversion device Download PDF

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Publication number
CN112217382A
CN112217382A CN202010111006.1A CN202010111006A CN112217382A CN 112217382 A CN112217382 A CN 112217382A CN 202010111006 A CN202010111006 A CN 202010111006A CN 112217382 A CN112217382 A CN 112217382A
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CN
China
Prior art keywords
flying capacitor
capacitor circuit
rectifying
main terminal
switching elements
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Pending
Application number
CN202010111006.1A
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Chinese (zh)
Inventor
藤田悟
松井优人
大西祐辅
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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Filing date
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Publication of CN112217382A publication Critical patent/CN112217382A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4837—Flying capacitor converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control

Abstract

When the current path is switched by the switch, a surge voltage exceeding the element withstand voltage may be generated. The present invention provides a flying capacitor circuit, including: a plurality of switching elements cascade-connected on a first surface of the substrate; a plurality of rectifying elements cascade-connected on the second surface of the substrate; and at least one capacitor provided in a wiring connecting between the main terminals of the switching elements and the rectifying elements, the switching elements and the rectifying elements being arranged in correspondence with each other, at least a part of the wiring being arranged in parallel with the substrate interposed therebetween.

Description

Flying capacitor circuit, circuit module and power conversion device
Technical Field
The invention relates to a flying capacitor circuit, a circuit module and a power conversion device.
Background
Conventionally, in a flying capacitor circuit, a current flowing through a current path provided with a flying capacitor is switched by a switch (see, for example, patent document 1).
Patent document 1: international publication No. 2015/037537
Disclosure of Invention
Technical problem to be solved by the invention
However, when the current path is switched by the switch, a surge voltage exceeding the element withstand voltage may be generated.
Technical scheme for solving technical problem
In order to solve the above problem, a first embodiment of the present invention provides a flying capacitor circuit. The flying capacitor circuit may include a plurality of switching elements connected in cascade on the first surface of the substrate. The flying capacitor circuit may have a plurality of rectifier elements connected in cascade on the second surface of the substrate. The flying capacitor circuit may include at least one capacitor provided in a wiring connecting between a corresponding one of the plurality of switching elements and the plurality of rectifying elements and the main terminal of the rectifying element. The wirings may be arranged at least partially in parallel with the substrate interposed therebetween.
The plurality of switching elements and the plurality of rectifying elements may be cascade-connected on mutually parallel straight lines, respectively.
The plurality of switching elements and the plurality of rectifying elements may be connected in series on the same straight line in plan view.
In the flying capacitor circuit, at least one capacitor may be provided in each of a plurality of wirings connecting the corresponding switching elements of the plurality of switching elements and the plurality of rectifying elements and the main terminal of the rectifying element, except for a wiring connecting the main terminal on the most one end side of the plurality of switching elements connected in cascade and the main terminal on the most one end side of the plurality of rectifying elements connected in cascade.
The number of capacitors provided between a corresponding one of the plurality of switching elements and the plurality of rectifying elements and the main terminal of the rectifying element may be different from the number of capacitors provided between the other one of the groups of switching elements and the main terminal of the rectifying element.
The number of capacitors provided between the switching element located on the input terminal side of the flying capacitor circuit and the main terminal of the rectifying element among the plurality of switching elements and the plurality of rectifying elements may be different from the number of capacitors provided between the switching element located on the output terminal side and the main terminal of the rectifying element.
The wirings may be provided in a linear shape on the first surface and the second surface, respectively.
Each of the wirings may have a connection direction extending portion on each of the first and second surfaces, the connection direction extending portion extending along a current path of the plurality of switching elements or the plurality of rectifying elements connected in cascade on the surface. At least one capacitor may be provided to the connection direction extension.
The at least one capacitor may be a plurality of capacitors connected in series with the wiring and arranged on the first surface and the second surface.
The capacitor disposed on the first surface and the capacitor disposed on the second surface may be disposed to be shifted from each other in a plan view.
The switching elements and the rectifying elements may be arranged to be shifted from each other in a plan view.
The flying capacitor circuit may further include a heat sink provided at least one of a position facing each capacitor across the substrate, a position facing each switching element, and a position facing each rectifying element.
Each rectifying element may be a switching element.
The flying capacitor circuit may be an inverter. An output terminal may be provided at a midpoint of a wiring connecting the main terminal on the one end side of the plurality of switching elements connected in cascade and the main terminal on the one end side of the plurality of rectifying elements connected in cascade. The main terminal on the other end side of the plurality of switching elements connected in cascade and the main terminal on the other end side of the plurality of rectifying elements connected in cascade may be input terminals for direct current.
The flying capacitor circuit may include a plurality of first drive circuits that are disposed on the first surface and that independently drive the plurality of switching elements. The flying capacitor circuit may include a plurality of second driving circuits that are disposed on the second surface and independently drive a plurality of rectifying elements each serving as a switching element. The first drive circuits and the second drive circuits may be arranged to be offset from each other in a plan view.
Each rectifying element may be a diode.
The second embodiment of the present invention provides a circuit module. The circuit module may include a switching element mounted on the first surface of the substrate. The circuit module may include a rectifying element mounted on the second surface of the substrate. The circuit module may include at least one capacitor provided in a wiring connecting between the switching element and the main terminal of the rectifying element. The wirings may be arranged at least partially in parallel with the substrate interposed therebetween.
The circuit module may include a first connection terminal connected to the first main terminal of the switching element and a second connection terminal connected to the first main terminal of the rectifying element at one end portion. The circuit module may include a third connection terminal connected to the second main terminal of the switching element and a fourth connection terminal connected to the second main terminal of the rectifying element at the other end portion.
The third aspect of the present invention provides a flying capacitor circuit. The flying capacitor circuit may cascade a plurality of circuit blocks of the second method.
A fourth aspect of the present invention provides a power conversion apparatus. The power conversion device may include the flying capacitor circuit of the first or third aspect. The power conversion device may include a dc power supply that supplies dc power to the flying capacitor circuit.
The summary of the invention described above is not intended to list all of the necessary features of the present invention. Sub-combinations of these feature groups may also constitute the invention.
Drawings
Fig. 1 shows a power conversion device 1 according to the present embodiment.
Fig. 2 shows a relationship between the on/off states of the switching elements 21 and 22 and the output voltage of the flying capacitor circuit 2.
Fig. 3 shows a current path through the third wiring 28.
Fig. 4 shows a flying capacitor circuit 2 according to a modification.
Fig. 5 shows a flying capacitor circuit 2 according to a modification.
Fig. 6 shows a circuit module 5 according to a modification.
Fig. 7 shows an external appearance of the circuit module 5 of fig. 6.
Fig. 8 shows a current path through the third wiring 28 in the flying capacitor circuit 2 in which the circuit blocks 5 in fig. 6 are cascade-connected.
Fig. 9 shows a flying capacitor circuit 2 according to a modification.
Fig. 10 shows a flying capacitor circuit 2 according to a modification.
Fig. 11 shows a modification of the arrangement positions of the switching elements 21 and 22.
Fig. 12 shows a flying capacitor circuit 2 according to a modification.
Fig. 13 shows a flying capacitor circuit 2 according to a modification.
Fig. 14 shows a flying capacitor circuit 2 according to a modification.
Fig. 15 shows a power conversion device 1 according to a modification.
Detailed Description
The present invention will be described below with reference to embodiments thereof, but the following embodiments do not limit the invention according to the claims. In addition, the combination of the features described in the embodiments is not all necessary for the technical means to solve the technical problems of the present invention.
[1. Structure of Power conversion device 1]
Fig. 1 shows a power conversion device 1 according to the present embodiment. The power conversion device 1 includes a dc power supply 10, a flying capacitor circuit 2, and an LC filter 11.
[1-1. DC Power supply 10]
A dc power supply 10 supplies dc power Vin to the flying capacitor circuit 2. The dc power supply may be a rectifier circuit that rectifies an ac current supplied from the power system. One or more filter capacitors (not shown) may be provided between dc power supply 10 and flying capacitor circuit 2 to filter dc Vin provided by dc power supply 10. In the case where an alternating current is output from the power conversion apparatus 1, 2 filter capacitors may be provided, a midpoint of which may be a return stroke of the alternating current.
[1-2. flying capacitor circuit 2]
The flying capacitor circuit 2 may be a multilevel flying capacitor circuit that performs power conversion by a flying capacitor method, and in the present embodiment, it is, for example, an inverter that converts a dc voltage from the dc power supply 10 into a multilevel voltage. The flying capacitor circuit 2 includes a plurality of switching elements 21 provided on a substrate 20, a plurality of rectifying elements (switching elements in the present embodiment) 22, and at least one capacitor 25.
In fig. 1, the flying capacitor circuit 2 is illustrated as being divided into a portion on the first surface 201 side, a portion on the second surface 202 side, and a portion between the first surface 201 and the second surface 202 of the substrate 20. In the present embodiment, the flying capacitor circuit 2 is, for example, a flying capacitor circuit of N +1 level (N is an integer of 1 or more), and includes N switching elements 21 (also referred to as switching elements 21)1～21N) N switching elements 22 (also referred to as switching elements 22)1～22N) 2N capacitors 25 (also referred to as capacitors 25)a 1～25a N、25b 1～25b N). Here, N is, for example, 3, 7, 13, etc., and may be another integer. The subscript "1" … … "N" represents the element number, and the superscripts "a", "b", etc. represent identifiers between like-numbered elements. In the present embodiment, for example, the switching elements 21 having the same element numbersn、22nAnd a capacitor 25n(N is an integer of 1. ltoreq. N. ltoreq.N) may correspond to each other.
[1-2-1. switching element 21]
Switching element 211～21NThe substrates 20 are connected in cascade on the first surface 201. In the present embodiment, the switching element 21 is provided, for example, from one end side (right side in the figure) of the substrate 20 to the other end side1Switch, and electronic device using the sameElement 212… … switching element 21NAre connected in cascade in that order. Each switching element 21 may be a surface-mounted device, and may have a main terminal 211 (also referred to as a main terminal 211) at one end side (right side in the drawing) in the connection direction1～211N) And a main terminal 212 (also referred to as a main terminal 212) on the other end side (left side in the figure)1～212N). The main terminals 211 and 212 may be disposed on the first surface 201. The main terminal may be an external terminal through which a main current flows. Each switching element 21 may have a control terminal, not shown, and may be driven by a control signal for the control terminal.
Switching element 211～21NIt is possible to connect to the first wirings 26 which are intermittently provided, thereby switching conduction and non-conduction between the first wirings 26. The first wiring 26 may be provided on the first surface 201 of the substrate 20, or may be provided in the substrate 20.
[1-2-2. switching element 22]
Switching element 221～22NAre cascade connected on the second side 202 of the substrate 20. In the present embodiment, the switching element 22 is provided, for example, from one end side (right side in the figure) of the substrate 20 to the other end side1Switching element 222… … switching element 22NAre connected in cascade in that order. Each switching element 22 may be a surface-mounted device, and may have a main terminal 221 (also referred to as a main terminal 221) on one end side (right side in the drawing) in the connection direction1～221N) And a main terminal 222 (also referred to as a main terminal 222) on the other end side (left side in the figure)1～222N). The terminals 221 and 222 may be disposed in the second surface 202. Each switching element 22 may have a control terminal, not shown, and may be driven by a control signal for the control terminal.
Switching element 221～21NIt is possible to connect to the second wiring 27 which is intermittently provided so as to switch conduction and non-conduction between the second wirings 27. The second wiring 27 may be provided on the second surface 202 of the substrate 20, or may be provided in the substrate 20.
[1-2-3 connection of switching elements 22, 22]
Switching element 211～21NAnd a switching element 221～22NMay be connected in cascade in parallel straight lines, respectively. The 2 straight lines may be the same straight line in a plan view. In the present embodiment, for example, the straight line extends between one end side (right side in the drawing) and the other end side (left side in the drawing) of the substrate 20.
Switching element 21 of the plurality of switching elements 21, 22 corresponding to each othernAnd a switching element 22n Main terminal 212 ofn、222n(or main terminal 211)n、221n) May be connected to each other by 1 third wiring 28. Switching element 21 connected in cascade1～21N、221～22NThe switching element 21 located at the most one end side (right side in the figure) of the centerN、22N Main terminal 211 of1、2211The third wiring 28 may connect the first and second electrodes. Therefore, in the present embodiment, for example, a total of N +1 third wirings 28 may be provided in the flying capacitor circuit 2.
Each of the third wirings 28 is an example of a wiring, and at least a part thereof is arranged side by side with the substrate 20 interposed therebetween. For example, the third wiring 28 may have a first section 281 provided on the first surface 201 and a second section 282 provided on the second surface 202, and the first section 281 and the second section 282 may be provided so as to be arranged across the substrate 20 in the entire section.
The wirings may be arranged side by side with the substrate interposed therebetween, and at least a part of the wirings may overlap in the width direction in a plan view, or the wirings may be arranged so as to be shifted by the thickness of the substrate 20 in a plan view. The offset arrangement may be arranged so as to be offset in position.
Thus, when at least a part of the third wires 28 are arranged side by side with the substrate 20 interposed therebetween, the sections arranged side by side act as a differential action to cancel the magnetic fluxes of each other, and thus the wire inductance of the third wires 28 is reduced. For example, the wiring inductance of the third wiring 28 can be reduced to 1/10 to 1/2 in comparison with the case where the third wiring 28 is not provided side by side with the substrate 20 interposed therebetween.
Each of the third wirings 28 may be provided in a straight line on the first surface 201 and the second surface 202. For example, the first segment 281 and the second segment of each third wire 28 are provided linearly. The first section 281 may extend in a direction (e.g., orthogonal direction) intersecting the first wiring 26, and the second section 282 may extend in a direction (e.g., orthogonal direction) intersecting the second wiring 27.
Each third wiring 28 may have a connection portion 283 between the first segment 281 and the second segment 282, the connection portion 283 extending in the thickness direction of the substrate 20 and connecting the first segment 281 and the second segment 282. The connection portion 283 may be, for example, a conductive through hole provided through the substrate 20, or may be a copper wire, a copper insert, a copper clip, or the like provided on a side portion of the substrate 20.
Switching elements 21 to be cascade-connected among the plurality of third wirings 281～21N、221～22N Main terminal 211 located at the most one end side (right side in the figure)1、2211An output terminal 203 may be provided at a midpoint of the third wiring 28 to be connected. Switching element 21 connected in cascade1～21N、221～22N Main terminal 212 located at the other end side (left side in the figure)N、222NMay be the input terminal 204 of the direct current Vin. In the present embodiment, for example, the main terminal 212N、222NThe positive and negative terminals of the dc power supply 10 may be connected.
[1-2-3. capacitor 25]
At least one capacitor 25 is provided in any of the third wirings 28. In the present embodiment, for example, the total of N +1 third wirings 28 are provided with the third wiring 28 having the output terminal 203, that is, the switching element 211～21N、221～22N Main terminal 211 located at the most one end side (right side in the figure)1、2211The N third wirings 28 other than the third wiring 28 to be connected may be provided with at least one capacitor 25, respectively. Accordingly, by turning on and off the switching elements 21 and 22, energy can be reliably exchanged between the capacitors 25, and power conversion can be performed. Except for the main terminal 2111、2211 Connected byThe capacitors 25 arranged on the first surface 201 may be connected in series to each of the N third wirings 28 other than the third wiring 28a nAnd a capacitor 25 disposed on the second surface 202b nThese two capacitors 25.
Each capacitor 25 may be a surface mount device, or may have terminals at both ends. Each capacitor 25 may be arranged along the third wiring 28 provided with the capacitor 25.
Here, the capacitors 25 provided in the 2 third wirings 28 adjacent in the connection direction of the switching elements 21 on the first surface 201a(e.g., capacitor 25)a N、25a (N-1)) The switching elements 21 (e.g., the switching elements 21) can be physically connected to each otherN) Sandwiched in between. Similarly, on the second surface 202, the capacitors 25 provided in the 2 third wirings 28 adjacent in the connection direction of the switching elements 22b(e.g., capacitor 25)b N、25b (N-1)) The switching elements 22 (e.g., switching elements 22) may be physically coupled to each otherN) Sandwiched in between.
Capacitor 25a 1～25a N、25b 1～25b NEach of the switching elements can function as a flying capacitor, and different voltages, for example, the capacitor 25 can be held depending on the number of cascade connections of the switching elements 21 and 22 from the output terminal 203, that is, the number of stages (for example, the element number in the present embodiment)a 1、25b 1 A capacitor 25 capable of holding a voltage of 1 XVin/N as a wholea 2、25b 2 A capacitor 25 capable of holding a voltage of 2 XVin/N as a wholea n、25b nThe voltage of N times Vin/N can be kept as a whole.
[1-2-4. base plate 20]
The substrate 20 may be formed by combining a plurality of substrates 200 (for example, N substrates 200 in the present embodiment)1～200N) And connecting to form. In this case, the flying capacitor circuit 2 may include a plurality of circuit modules 5 (for example, in the present embodiment) each of which includes the respective substrates 200For N circuit modules 51～5N) Are connected in cascade.
[1-2-5. Circuit Module 5]
Each circuit module 5n(where N is an integer of 1. ltoreq. N. ltoreq.N) may be mounted on the substrate 200nOn the first side 201 of the switching element 21nAnd a switching element 22 mounted on the second surface 202nA switching element 21 provided in the substratenAnd a switching element 22n Main terminal 212 ofn、222nAt least 1 capacitor 25 in the third wiring 28 connected therebetweenn(for example, 2 capacitors 25 in the present embodiment)a n、25b n). The third wiring 28 may have at least a portion sandwiching the substrate 200nAre arranged side by side. Accordingly, at least a part of the third wiring 28 is arranged side by side with the substrate 20 interposed therebetween.
In addition, each circuit module 5nOne of the ends (the right end in the figure) may have a switching element 21n Main terminal 211 ofn First connection terminal 501 and switching element 22 connected theretonMain terminal 221nAnd a second connection terminal 502 connected thereto. Each circuit module 5nMay have a switching element 21 at the other end (the left end in the figure)n Main terminal 212 ofn Third connection terminal 503 connected to switching element 22n Main terminal 222 ofnAnd a fourth connection terminal 504 connected.
The first connection terminal 501 may be connected to a third connection terminal 503 of another circuit module 5, and the second connection terminal 502 may be connected to a fourth connection terminal 504 of another circuit module 5. Thus, the plurality of circuit blocks 5 connected form the flying capacitor circuit 2. The first to fourth connection terminals 501 to 504 may be connected by copper wires, copper clips, or the like.
The following circuit modules 5 are preferably used for each circuit module 5: when the third wirings 28 provided side by side with the substrate 200 interposed therebetween in a plan view are different in degree of overlapping, the degree of overlapping of the third wirings 28 in a plan view increases at a position where a larger potential difference is generated between the main terminals 211 and 221 and/or between the main terminals 212 and 222 every time the flying capacitor circuit 2 is formed. Thus, the surge voltage generated by the switching can be reliably reduced.
[1-3.LC Filter 11]
LC filter 11 is connected to output terminal 203 of flying capacitor circuit 2. When the power conversion device 1 outputs an alternating current, the LC filter 11 can change the multilevel output voltage output from the flying capacitor circuit 2 into a sine wave. When the flying capacitor circuit 2 outputs a direct current, the LC filter can function as a low-pass filter for removing high-frequency noise.
According to the flying capacitor circuit 2 described above, since at least a part of each of the third wirings 28 connecting the switching elements 21 and 22 via the capacitors 25 is arranged in parallel with the substrate 20 interposed therebetween, the respective magnetic fluxes cancel each other out between the parallel arrangement areas. Therefore, the wiring inductance of the third wiring 28 can be reduced, and the surge voltage generated by switching of the switching elements 21 and 22 can be reduced.
Further, since the third wirings 28 are provided linearly on the first surface 201 and the second surface 202, the third wirings 28 can be shortened and the wiring inductance can be reduced as compared with a case where the third wirings 28 are provided non-linearly. Thus, the surge voltage generated in the third wiring 28 due to switching can be reliably reduced.
In addition, since the capacitors 25 are provided in series in the third wiring 28, even when one capacitor 25 on the third wiring 28 is damaged, the flying capacitor circuit 2 can be prevented from being short-circuited.
In addition, since 2 capacitors 25 provided in series in the third wiring 28 are provided on the first surface 201 and the second surface 202, it is possible to align the positions of the third wirings 208 on the first surface 201 and the second surface 22, compared with a case where they are provided only on a single surface. Therefore, the section of the third wiring 28 arranged in parallel with the substrate 20 interposed therebetween can be made longer, and therefore, the wiring inductance of the third wiring 28 can be reliably reduced, and the surge voltage can be reliably reduced.
In addition, the switching element 211～21NAnd a switching element 221～22NIn the case of the respective upper-stage linear connections, the path of the main current can be shortened and the wiring inductance of the path can be reduced, as compared with the case of not the upper-stage linear connections. Thus, the surge voltage generated in the path of the main current due to the switching can be reduced.
In addition, the switching element 211～21NAnd a switching element 221～22NSince the third wirings 28 are connected in cascade on straight lines parallel to each other, the lengths of the third wirings can be kept constant. Therefore, the surge voltage generated in each third wiring 28 can be similarly reduced.
In addition, the switching element 211～21NAnd a switching element 221～22NSince the first wirings 28 are connected in series on the same straight line in a plan view, the end of the first section 281 provided on the first surface 201 and the end of the second section 282 provided on the second surface 202 of the first wiring 28 can be aligned on both surfaces of the substrate 20. Therefore, the section of the third wiring 28 arranged in parallel with the substrate 20 interposed therebetween can be made longer, and therefore, the wiring inductance of the third wiring 28 can be reliably reduced, and the surge voltage can be reliably reduced.
According to the above-described circuit module 5, since at least a part of each of the third wirings 28 connecting the switching elements 21 and 22 via the capacitors 25 is arranged in parallel with the substrate 20 interposed therebetween, the respective magnetic fluxes are cancelled out between the parallel arrangement areas. Therefore, the wiring inductance of the third wiring 28 can be reduced, and the surge voltage generated by switching can be reduced.
In addition, the terminal has a main terminal 211 at one endnA first connection terminal 501 and a main terminal 221 connected to each othernA second connection terminal 502 connected to the main terminal 212 at the other endn Third connection terminal 503 connected to main terminal 222nSince the fourth connection terminal 504 is connected, by connecting an arbitrary number of circuit blocks 5, an arbitrary number of flying capacitor circuits 2 of an arbitrary level can be formed.
[2. operation of flying capacitor circuit 2]
Fig. 2 shows a relationship between the on/off states of the switching elements 21 and 22 and the output voltage of the flying capacitor circuit 2. As shown in the figure, flying capacitor circuit 2 can generate and output N +1 levels of voltage from dc voltage Vin by controlling on and off of switching elements 21 and 22. The output voltage may be Vin/2(═ N · Vin/2N), (N-2) · Vin/2N, (N-4) · Vin/2N, (N-6) · Vin/2N, …, -Vin/2(═ N-2N) · Vin/2N), for example.
[2-1. Current Path in flying capacitor Circuit 2]
Fig. 3 shows a current path through the third wiring 28. The dashed arrows in the figure indicate the flow of current. The left half of the drawing shows a current path divided into a portion on the first surface 201 side, a portion on the second surface 202 side, and a portion between the first surface 201 and the second surface 202 of the substrate 20, and the right half of the drawing shows the current path when the flying capacitor circuit 2 is viewed from the side.
In the flying capacitor circuit 2 according to the present embodiment, at least a part of the third wiring 28 provided with the capacitor 25 is arranged in parallel with the substrate 20 interposed therebetween. Therefore, when a current flows through the third wire 28 as shown in the left side portion of the figure, the sections arranged side by side perform a differential operation so that the magnetic fluxes cancel each other out as shown in the right side portion of the figure. Thus, the wiring inductance of the third wiring 28 becomes small.
In the above embodiment, it has been described that at least a part of each third wiring 28 is arranged side by side with the substrate 20 interposed therebetween, but the third wiring 28 provided with the output terminal 203 may be arranged side by side without interposing the substrate 20 interposed therebetween.
[3. modification ]
Fig. 4 shows a flying capacitor circuit 2 according to a modification.
The flying capacitor circuit 2 may include a third wiring 28A. Each of the third wirings 28A may have a connection direction extension portion 285 on the first surface 201 and the second surface 202, respectively, and the connection direction extension portion 295 may be connected in cascade along the switching element 21 connected to the surface1～21NOr a switching element 221～22NThe current path of (a) is extended. The first and second regions 281 and 282 of each third wiring 28A may beAre respectively arranged in a zigzag manner in the first surface 201 and the second surface 202, and can be arranged along the direction away from the switching element 211～21NOr a switching element 221～22NHas a connection direction extending portion 285 at the front end extending in the direction of the current path. The connection direction extension 285 may be connected from the main terminal 211 of the connection target of the third wiring 28An(or 221)n) Side to the other main terminal 212n(or 222)n) The sides extend. The connection direction extension 285 does not have to be connected to the switching element 211～21NOr a switching element 221～22NAre parallel.
Each capacitor 25 may be provided to the connection direction extension portion 285. In the present embodiment, for example, each capacitor 25nMay be along the switching element 21nOr a switching element 22nThe setting is performed. In the case where 3 or more capacitors 25 are provided in the third wiring 28A, 1 or more capacitors 25 may be provided on a single connection direction extending portion 285 provided in each of the first section 281 and the second section 282 of the third wiring 28A. A plurality of connection direction extending portions 285 may be provided in the first section 281 and/or the second section 282, and a capacitor 25 may be provided in each of the connection direction extending portions 285 instead. For example, in the case where the first section 281 is provided with the plurality of connection direction extending portions 285, the first section 281 may be provided in a meandering manner within the first face 201. The third wiring 28 provided with the output terminal 203 (for example, the main terminal 211)1、2211The third wiring 28 to be connected) may not have the connection direction extension 285.
Each third wiring 28A may have a through hole as the connection portion 283. Through holes may be provided at ends of the connection direction extending parts 285 in the first and second faces 201 and 202 and connect the connection direction extending parts 285 to each other.
The flying capacitor circuit 2 may include MOSFETs as the switching elements 21 and 22. The switching elements 21, 22 may be connected in reverse cascade with each other. In the present embodiment, for example, each switching element 21 has a source terminal on the output terminal 203 side, a drain terminal on the input terminal 204 side, and each switching element 22 has a drain terminal on the output terminal 203 side and a source terminal on the input terminal 204 side. The respective switching elements 21, 22 may be connected in anti-parallel with a free wheeling diode. The free wheeling diodes may be parasitic diodes as the switching elements 21, 22 of the MOSFETs. The switching elements 21 and 22 are not limited to MOSFETs, and may be other switching elements such as IGBTs.
According to the flying capacitor circuit 2 described above, each third wiring 28 has the connection direction extending portion 285 extending along the element connection direction, and the capacitor 25 is provided in the connection direction extending portion 285. Therefore, the capacitor 25 can be physically provided at a position other than the positions between the switching elements 21 and the positions between the switching elements 22 connected in cascade, and therefore, the interval between the switching elements 21 and the interval between the switching elements 22 can be shortened, and the flying capacitor circuit 2 can be downsized.
Fig. 5 shows a flying capacitor circuit 2 according to a modification.
The flying capacitor circuit 2 may have mutually corresponding switching elements 21nAnd a switching element 22n Main terminal 212 ofnAnd main terminal 222nMiddle and main terminal 211nAnd main terminal 221n Third wirings 28 are provided therebetween, and a capacitor 25 may be provided in each third wiring 28. Thus, one set of switching elements 21n、22nAnd adjacent other groups of switching elements 21n+1、22n+1The capacitor 25 is connected in parallel therebetween, and therefore, the capacitance between the switching element 21 and the switching element 22 can be increased.
Fig. 6 shows a circuit module 5 according to a modification. The circuit modules 5 may have switching elements 21 corresponding to each othernAnd a switching element 22n Main terminal 212 ofnAnd main terminal 222nMiddle and main terminal 211nAnd main terminal 221nWith third wirings 28A therebetween, respectively.
Main terminal 212nAnd main terminal 222nA third wiring 28A for connecting the main terminal 211 and the second wiringnAnd main terminal 221nThe third wiring 28A connected to each other may sandwich the switching element 21 between the first surface 201 and the second surface 202nOr a switching element 22nBut on the opposite side. Main terminal 212nAnd main terminal 222n A capacitor 25 provided in a third wiring 28A connected therebetweenn Main terminal 211nAnd main terminal 221n A capacitor 25 provided in a third wiring 28A connected therebetweennThe connection direction extension 285 may be disposed so as to be connected to the switching element 21 on the first surface 201 and the second surface 2021～21N Switching element 221～22NThe switching element 21 is arranged in a direction in which the current paths intersect (e.g., orthogonal direction in the present modification)nOr a switching element 22nSandwiched in between.
Fig. 7 shows an external appearance of the circuit module 5 of fig. 6. The upper part of the figure shows the appearance of the first surface 201, and the lower part shows the appearance of the second surface 202. Each capacitor 25 may have terminals at both ends and may be disposed along the connection direction extending portion 285. The end of the connection direction extending portion 285 may be provided with a through hole as the connection portion 283 and connect the connection direction extending portions 285 of the first and second faces 201 and 202 to each other.
Fig. 8 shows a current path through the third wiring 28 in the flying capacitor circuit 2 in which the circuit blocks 5A in fig. 6 are cascade-connected. In the figure, the illustration of the switching elements 21, 22 is simplified. Shown is a switching element 21n、22n-1、21n-2In the on state, the switching element 22n、21n-1、22n-2A path of a current flowing when in an off state.
In this modification, as shown by the hatching in the figure, the main terminal 211 is providednAnd main terminal 221nA third wiring 28A for connecting the main terminal 211 and the second wiringn-1And main terminal 221n-1In the parallel-arranged sections of the connected third wirings 28A, the magnetic fluxes are cancelled out, and the wiring inductance of each third wiring 28A is reduced.
Fig. 9 shows a flying capacitor circuit 2 according to a modification. In the flying capacitor circuit 2 according to the present modification, a corresponding pair of switching elements 21 are providedn、22n Main terminal 211 ofn、221nInter and/or master endSeed 212n、222n Switching elements 21 of other groupsm、22m(where m is an integer of m ≠ N and 1. ltoreq. m.ltoreq.N) of the main terminal 211m、221mInter and/or main terminal 212m、222mThe number of capacitors 25 provided between the main terminals may be different from one another. For example, the number of capacitors 25 disposed between the main terminals 211, 221 and/or 212, 222 on the input terminal 204 side, 211, 221 and/or 212, 222 on the output terminal 203 side may be different. More specifically, the number of capacitors 25 arranged in series and/or in parallel between the main terminals 211, 221 and/or the main terminals 212, 222 that generate a larger potential difference is larger than that between the main terminals 211, 221 and/or the main terminals 212, 222 that generate a smaller potential difference. In the present embodiment, for example, the number of capacitors 25 arranged in series and in parallel between the main terminals 211, 221 on the input terminal 204 side is larger than the number of capacitors 25 arranged in series and in parallel between the main terminals 211, 221 on the output terminal 203 side. For example, the main terminal 211n、221nWith 4 capacitors 25 in between, and a main terminal 211n-2、221n-2With only 1 capacitor 25 in between. However, the main terminal 211 may be the samen、221n(or main terminal 212)n、222n) Instead of increasing the number of capacitors 25 connected in parallel between the main terminals, the capacitance of the capacitors 25 provided between each other increases.
Corresponding main terminal 211n、221n(or main terminal 212)n、222n) In the case where the capacitor 25 is provided in parallel, a plurality of third wirings 28A or connection direction extending portions 285 may be provided in parallel between the main terminals.
According to the flying capacitor circuit 2 of the present modification example, the main terminal 211 is providedn、221nInter and/or main terminal 212n、222nThe number of capacitors 25 arranged in between is different from the main terminal 211m、221mInter and/or main terminal 212m、222mThe number of capacitors 25 provided in between. Thus, inWhen the number of capacitors 25 connected in series is different, the voltage applied to each capacitor 25 can be reduced between the main terminals having a large number of capacitors 25, and thus the capacitors 25 can be prevented from being damaged by the voltage application. In addition, when the number of capacitors 25 connected in parallel is different, the capacitance can be increased between the main terminals having a large number of capacitors 25, and the amount of energy exchanged with the other capacitors 25 can be increased.
Further, since the number of capacitors 25 on the input terminal 204 side and the output terminal 203 side is different, by increasing the number of capacitors 25 connected in series on either side, it is possible to reliably prevent the capacitors 25 from being damaged by voltage application, and by increasing the number of capacitors 25 connected in parallel, it is possible to increase the capacitance, and to efficiently increase the amount of energy exchanged with the other capacitors 25.
In the present modification, the case where the third wiring 28A having the connection direction extending portion 285 is provided between the main terminals of the switching elements 21 and 22 has been described, but the third wiring 28 not having the connection direction extending portion 285 may be provided.
Fig. 10 shows a flying capacitor circuit 2 according to a modification. The flying capacitor circuit 2 according to the present modification example is formed by cascade-connecting circuit blocks 5 shown in fig. 6, similarly to the flying capacitor circuit 2 shown in fig. 8. However, in the flying capacitor circuit 2 of the present modification, the circuit block 5 at the center in the figure is connected in the reverse direction. In this case, power conversion can be performed reliably by the flying capacitor circuit 2.
Fig. 11 shows a modification of the arrangement positions of the switching elements 21 and 22. In the present modification, the switching elements 21 and the switching elements 22 are arranged to be shifted from each other in a plan view. For example, corresponding groups of switching elements 21nAnd each switching element 22nThe respective members may be arranged to be shifted from each other in a plan view. In the present modification, for example, the switching elements 21 and 22 are shifted in the direction of cascade connection. Accordingly, the heat generated by the switching elements 21 and 22 can be dissipated from the opposite surfaces of the switching elements 21 and 22 through the substrate 20.
Similarly, although not shown, the plurality of capacitors 25Capacitor 25 disposed on first surface 201aAnd a capacitor 25 disposed on the second surface 202bThe substrates may be arranged to be shifted from each other in a plan view. For example, 2 capacitors 25 are provided in series in 1 third wiring 28a、25bAnd are disposed on the first surface 201 and the second surface 202, these capacitors 25a、25bThe substrates may be arranged to be shifted from each other in a plan view. In this embodiment, for example, the capacitor 25a、25bMay be staggered along the third wiring 28. Accordingly, the heat generated by each capacitor 25 can be dissipated from the side opposite to the capacitor 25 through the substrate 20.
Fig. 12 shows a flying capacitor circuit 2 according to a modification. The left half of the drawing is a view of the flying capacitor circuit 2 from the first surface 201 side and the second surface 202 side, and the right half of the drawing is a view of the flying capacitor circuit 2 from the side. The hollow arrows in the figure indicate the direction of flow of the heat.
When the switching elements 21 and 22 are arranged to be shifted from each other in a plan view, the heat sink 205 is provided at least at one of a position facing each switching element 21 and a position facing each switching element 22 with the substrate 20 interposed therebetween. Thus, as shown in the right part of the figure, the heat generated by the switching element 21 or the switching element 22 can be efficiently dissipated. In the present modification, the heat sink 205 is a surface-mount type heat sink, for example. The heat sink 205 may be electrically connected, or may be soldered to the first wiring 26 or the second wiring 27. The heat sink 205 may be a metal plate made of aluminum, iron, copper, or the like.
Similarly, the capacitor 25 disposed on the first surface 201aA capacitor 25 disposed on the second surface 202bIn the case where the capacitors are arranged to be shifted from each other in a plan view, the heat sink 205 may be provided at least one of the positions facing each capacitor 25 with the substrate 20 interposed therebetween. Thus, the heat generated by the capacitor 25 can be efficiently dissipated.
Fig. 13 shows a flying capacitor circuit 2 according to a modification. The flying capacitor circuit 2 may include a pair of switching elements 211～21NMultiple drives independently drivenCircuit 23 (also referred to as drive circuit 23)1～23N) And a switching element 221～22NA plurality of drive circuits 24 (also referred to as drive circuits 24) that drive independently1～24N). Each driving circuit 231～23N、241～24NCan be connected with the switching element 211～21N、221～22NOne for each, a control signal may be provided to the corresponding switching element 21 or switching element 22.
Wherein the drive circuit 231～23NIs an example of a first driving circuit, and may be disposed on the first face 201. Drive circuit 231～23N Switching element 21 capable of being driven1～21NAre adjacently disposed. Also, the drive circuit 241～24NIs an example of a second driving circuit, and may be disposed on the second side 202. Drive circuit 241～24N Switch element 22 capable of being connected with driving object1～22NAre adjacently disposed. The driving circuit 23 and the driving circuit 24 may drive the switching elements 21 and 22 at different potentials, and the ground potentials of the two may be different.
Fig. 14 shows a flying capacitor circuit 2 according to a modification. Drive circuit 231～23NAnd a drive circuit 241～24NThe substrates may be arranged to be shifted from each other in a plan view. Accordingly, the heat generated by the drive circuits 23 and 24 can be dissipated from the side of the opposite surfaces of the drive circuits 23 and 24 through the substrate 20. Further, since noise generated by switching can be prevented from affecting the drive circuits 23 and 24 on the opposite side through the substrate 20, malfunction of the drive circuits 23 and 24 can be prevented.
The direction in which the drive circuits 23 and 24 are shifted may be the connection direction of the switching element 21 or the switching element 22, or may be the direction in which they intersect (for example, the orthogonal direction). In the figure, the switching elements 21 and the switching elements 22 are arranged to be shifted from each other in a plan view, but the switching elements 21 and 22 may be shifted from each other without shifting the driving circuits 23 and 24. The heat sink 205 may be provided at least at one position of the positions facing the drive circuits 23 and 24 with the substrate 20 therebetween.
Fig. 15 shows a power conversion device 1 according to a modification. The flying capacitor circuit 2 of the power conversion device 1 may include a diode 29 as each rectifying element instead of the switching element 21. For example, the flying capacitor circuit 2 may include N diodes 29 (also referred to as diodes 29)1～29N). Each diode 29 may be a surface mount device, or may be provided with a cathode terminal 291 (also referred to as a cathode terminal 291) as a main terminal on one end side (right side in the drawing)1～291N) And an anode terminal 292 (also referred to as an anode terminal 292) as a main terminal is provided on the other end side (left side in the drawing)1～292N) And cascade connection is performed.
In the present modification, the flying capacitor circuit 2 may be a boost chopper circuit, for example. For example, the switching elements 22 to be cascade-connected1～22NThe main terminal 222 located at the other end side (left side in the figure)NWith cascade-connected diodes 291～29N Anode terminal 292 closest to the other end sideNThe switching elements 22 connected in cascade at the midpoint of the third wiring 28 to be connected1～22N Main terminal 211 located at the most one end side (right side in the figure)1May be the input terminal 204 of the direct current Vin. In addition, the switching elements 22 are cascade-connected1～22N Main terminal 211 located at the most one end side (right side in the figure)1With cascade-connected diodes 291～29NThe cathode terminal 291 at the most one end side1May be an output terminal 203 for direct current. The third wiring 28 provided with the input terminal 204 may not be provided side by side with the substrate 20 interposed therebetween.
The power conversion device 1 may include an inductor 290 between the dc power supply 10 and the flying capacitor circuit 2. In the present embodiment, for example, the inductor 290 is provided between the positive-side terminal of the dc power supply 10 and the positive-side input terminal 204 of the flying capacitor circuit 2, but may be provided between the negative-side terminal of the dc power supply 10 and the negative-side input terminal 204 of the flying capacitor circuit 2. The inductor 290 may be in the switching element 221～22NOne of them is onEnergy is stored by flowing current, and when the switching element is turned off, the energy is discharged as current.
Since the flying capacitor circuit 2 described above includes the diode 29 as the rectifying element, the flying capacitor circuit 2 can be used as a chopper. In the present modification, the flying capacitor circuit 2 is described as a step-up chopper, but may be used as a step-down chopper.
[4. other modifications ]
In the above-described embodiment and modification, the case where the flying capacitor circuit 2 is formed by cascade-connecting a plurality of circuit modules 5 has been described, but the flying capacitor circuit may be integrally formed on the substrate 20 without using the circuit modules 5.
Further, although the power conversion device 1 has been described as having only one flying capacitor circuit 2, a plurality of flying capacitor circuits 2 may be provided in parallel. The plurality of flying capacitor circuits 2 may be provided on the same substrate 20, or may be provided on separate substrates 20. When each of the plurality of flying capacitor circuits 2 functions as an inverter, the entire power conversion device 1 may function as a single-phase inverter or a multi-phase inverter such as a three-phase inverter.
The present invention has been described above with reference to the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes and modifications can be made in the above embodiments. The embodiments in which the above-described various changes and modifications are made are also included in the technical scope of the present invention, as is apparent from the description of the patent claims.
It should be noted that the execution order of the respective processes of the actions, sequences, steps, stages, etc. in the devices, systems, programs, and methods shown in the claims, the description, and the drawings may be implemented in an arbitrary order as long as the "before", etc. are not particularly explicitly shown, or in a case where the following process is to be used as the output of the preceding process. In the operation flows in the claims, the specification, and the drawings, the terms "first", "next", and the like are used for convenience of description, but the terms do not necessarily mean that the operations are performed in this order.
Description of the reference symbols
1 a power conversion device; 2 a flying capacitor circuit; 5a circuit module; 10 a direct current power supply; 11 an LC filter; 20 a substrate; 21 a switching element; 22 a switching element; 23 a drive circuit; 24 a drive circuit; 25 capacitors; 26 a first wiring; 27 a second wiring; 28a third wiring; 29 diodes; 200 a substrate; 201 a first side; 202 a second face; 203 output terminals; 204 input terminals; 205 a heat sink; 211 a main terminal; 212 a main terminal; 221 a main terminal; 222 a main terminal; 281 a first interval; 282 a second interval; 283 a connecting part; 285 to the direction extension; 290 an inductor; 291 a cathode terminal; 292 an anode terminal; 501 a first connection terminal; 502 a second connection terminal; 503 third connection terminals; 504 a fourth connection terminal.

Claims (20)

1. A flying capacitor circuit, comprising:
a plurality of switching elements cascade-connected on a first surface of the substrate;
a plurality of rectifying elements cascade-connected on a second surface of the substrate; and
at least one capacitor provided in a wiring connecting the plurality of switching elements and corresponding ones of the plurality of rectifying elements to the main terminal of the rectifying element,
at least a part of the wirings are arranged in parallel with the substrate interposed therebetween.
2. The flying capacitor circuit of claim 1,
the plurality of switching elements and the plurality of rectifying elements are cascade-connected on mutually parallel straight lines, respectively.
3. The flying capacitor circuit of claim 1 or 2,
the plurality of switching elements and the plurality of rectifying elements are connected in series on the same straight line in plan view.
4. The flying capacitor circuit of any one of claims 1-3,
the plurality of wirings connecting the plurality of switching elements and the main terminals of the corresponding switching elements and the corresponding rectifying elements among the plurality of rectifying elements each include the at least one capacitor in each of the wirings other than the wiring connecting the main terminal on the one end side of the plurality of switching elements connected in cascade and the main terminal on the one end side of the plurality of rectifying elements connected in cascade.
5. The flying capacitor circuit of any one of claims 1-4,
the number of capacitors provided between a corresponding one of the plurality of switching elements and the plurality of rectifying elements and the main terminal of the rectifying element is different from the number of capacitors provided between the other groups of switching elements and the main terminal of the rectifying element.
6. The flying capacitor circuit of claim 4 or 5,
in the plurality of switching elements and the plurality of rectifying elements, the number of capacitors provided between the switching element located on the input terminal side of the flying capacitor circuit and the main terminal of the rectifying element is different from the number of capacitors provided between the switching element located on the output terminal side and the main terminal of the rectifying element.
7. The flying capacitor circuit of any one of claims 1-6,
each of the wirings is provided in a linear shape on the first surface and the second surface.
8. The flying capacitor circuit of any one of claims 1-6,
each wiring has a connection direction extending portion on the first surface and the second surface, respectively, the connection direction extending portion extending along a current path of the plurality of switching elements or the plurality of rectifying elements connected in cascade on the surface,
the at least one capacitor is disposed at the connection direction extension.
9. The flying capacitor circuit of any one of claims 1-8,
the at least one capacitor includes a plurality of capacitors provided in series in the wiring and arranged on the first surface and the second surface.
10. The flying capacitor circuit of claim 9,
the capacitor disposed on the first surface and the capacitor disposed on the second surface are arranged to be shifted from each other in a plan view.
11. The flying capacitor circuit of any one of claims 1-10,
the switching elements and the rectifying elements are arranged to be shifted from each other in a plan view.
12. The flying capacitor circuit of claim 10 or 11,
the flying capacitor circuit further includes a heat sink provided at least one of a position facing each capacitor across the substrate, a position facing each switching element, and a position facing each rectifying element.
13. The flying capacitor circuit of any one of claims 1-12,
each of the rectifying elements is a switching element.
14. The flying capacitor circuit of claim 13,
the flying capacitor circuit is an inverter,
an output terminal is provided at a midpoint of a wiring connecting a main terminal on the one end side of the plurality of switching elements connected in cascade and a main terminal on the one end side of the plurality of rectifying elements connected in cascade,
the main terminal on the other end side of the plurality of switching elements connected in cascade and the main terminal on the other end side of the plurality of rectifying elements connected in cascade are input terminals for direct current.
15. The flying capacitor circuit of claim 13 or 14, further comprising:
a plurality of first driving circuits disposed on the first surface and configured to independently drive the plurality of switching elements; and
a plurality of second driving circuits disposed on the second surface and independently driving the plurality of rectifying elements, wherein the plurality of rectifying elements are switching elements,
the first drive circuits and the second drive circuits are arranged to be shifted from each other in a plan view.
16. The flying capacitor circuit of any one of claims 1-12,
each rectifying element is a diode.
17. A circuit module, comprising:
a switching element mounted on the first surface of the substrate;
a rectifying element mounted on the second surface of the substrate; and
at least one capacitor provided in a wiring that connects the switching element and the main terminal of the rectifying element,
at least a part of the wirings are arranged in parallel with the substrate interposed therebetween.
18. The circuit module of claim 17,
a first connection terminal connected to the first main terminal of the switching element and a second connection terminal connected to the first main terminal of the rectifying element are provided at one end portion,
the other end portion of the first terminal includes a third connection terminal connected to the second main terminal of the switching element and a fourth connection terminal connected to the second main terminal of the rectifying element.
19. A flying capacitor circuit is characterized in that,
formed by a plurality of circuit modules according to claim 18 connected in cascade.
20. A power conversion apparatus, comprising:
the flying capacitor circuit of any one of claims 1-16, 19; and
a DC power supply to provide DC power to the flying capacitor circuit.
CN202010111006.1A 2019-07-11 2020-02-24 Flying capacitor circuit, circuit module and power conversion device Pending CN112217382A (en)

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